7 questions found
What is AWS Elastic Beanstalk and how does it simplify deploying applications compared to manually configuring infrastructure?
Beginner
AWS Elastic Beanstalk is a platform as a service offering that lets you simply upload your application code, and it automatically handles provisioning the underlying infrastructure, including EC2 instances, load balancers, Auto Scaling Groups, and monitoring, while still giving you full access to the underlying AWS resources if you need more control later, making it much faster to get an application running compared to manually configuring every piece of infrastructure yourself.
eb init my-application --platform node.js --region us-east-1
eb create my-environment
Real-world example
A small startup with limited infrastructure expertise deploys its web application using Elastic Beanstalk, getting a fully functioning, load balanced, and auto scaling environment running within minutes instead of spending days manually configuring EC2 and load balancers.
Common follow-ups: What is the difference between Elastic Beanstalk and manually configuring EC2 and Auto Scaling?;Which programming languages and platforms does Elastic Beanstalk support?
EC2 & Compute;Elastic Load Balancing (ALB
NLB & CLB)
What is the difference between an Elastic Beanstalk application and an environment?
Beginner
An Elastic Beanstalk application is essentially a logical container representing your overall project, which can have multiple environments underneath it, such as separate development, testing, and production environments, each running its own independent set of resources and its own version of your application code, letting you manage completely separate deployment stages under one organized application umbrella.
eb create dev-environment
eb create prod-environment
Real-world example
A development team creates two separate environments under the same Elastic Beanstalk application, a development environment for testing new features and a production environment serving real customer traffic, both independently managed but organized under a single application.
Common follow-ups: Can you promote a build from a development environment directly to production?;How many environments can a single application have?
AWS CodePipeline
CodeBuild & CodeDeploy (CI/CD);Auto Scaling Groups
How does Elastic Beanstalk handle application updates and deployment policies such as rolling and immutable deployments?
Intermediate
Elastic Beanstalk supports several deployment policies including all at once, which updates every instance simultaneously with brief downtime, rolling, which updates instances in batches while keeping some capacity available, and immutable, which launches an entirely new set of instances with the updated version and only shifts traffic to them once they pass health checks, providing the safest rollback option since the original instances remain untouched until the new version is confirmed healthy.
eb config --deployment-policy Immutable
Real-world example
A company deploying a critical update to its production environment chooses the immutable deployment policy, ensuring that if the new version fails its health checks, traffic never shifts away from the still healthy original instances, avoiding any customer facing downtime.
Common follow-ups: What is the tradeoff between rolling and immutable deployments in terms of cost and speed?;How do you configure the batch size for a rolling deployment?
AWS CodePipeline
CodeBuild & CodeDeploy (CI/CD);Monitoring (CloudWatch)
How does Elastic Beanstalk use configuration files, commonly called ebextensions, to customize the underlying environment?
Intermediate
Elastic Beanstalk lets you include a folder of configuration files, with a dot ebextensions extension, directly within your application source bundle, which can customize the underlying environment beyond the default settings, such as installing additional software packages, running custom setup commands, or modifying configuration files on the EC2 instances, all automatically applied every time the environment is created or updated.
# .ebextensions/01_packages.config
packages:
yum:
git: []
Real-world example
A development team includes an ebextensions configuration file that automatically installs a required system package and sets a custom environment variable on every EC2 instance in their Elastic Beanstalk environment, ensuring consistent configuration across every deployment.
Common follow-ups: What is the difference between ebextensions and using a custom Amazon Machine Image?;Can ebextensions run commands only during environment creation, or also during updates?
EC2 & Compute;IaC (CloudFormation)
How does Elastic Beanstalk support blue green deployments using environment swapping?
Intermediate
Elastic Beanstalk supports a blue green deployment approach by letting you create a brand new environment running the updated application version alongside your existing live environment, thoroughly test the new environment while it is completely separate from production traffic, and then perform a CNAME swap that instantly redirects traffic from the old environment to the new one, with the ability to swap back immediately if any problem is discovered after the switch.
eb swap old-environment-name --destination-name new-environment-name
Real-world example
A company preparing a major application update creates a completely new Elastic Beanstalk environment for the updated version, thoroughly validates it separately from live traffic, then performs a CNAME swap to instantly cut production traffic over, keeping the old environment ready as an instant rollback option.
Common follow-ups: How quickly does traffic switch over after performing a CNAME swap?;What happens to the old environment after a successful swap?
Amazon Route 53 & DNS Management;AWS CodePipeline
CodeBuild & CodeDeploy (CI/CD)
How does Elastic Beanstalk's underlying use of CloudFormation give advanced users more control over the resources it creates?
Advanced
Behind the scenes, Elastic Beanstalk uses AWS CloudFormation to actually provision and manage all of the underlying resources in an environment, and advanced users can directly customize the generated CloudFormation resources using configuration options, or even reference their own separate CloudFormation resources from within an ebextensions file, giving experienced teams a way to extend Elastic Beanstalk's simplicity with custom infrastructure needs beyond what the platform exposes through its own configuration options alone.
# .ebextensions/02_resources.config
Resources:
MyCustomQueue:
Type: AWS::SQS::Queue
Real-world example
An experienced team uses an ebextensions configuration file to define a custom SQS queue as an additional CloudFormation resource directly within their Elastic Beanstalk environment, extending the platform beyond its standard built in capabilities.
Common follow-ups: How do you view the actual CloudFormation stack that Elastic Beanstalk creates behind the scenes?;What happens to custom CloudFormation resources if the Elastic Beanstalk environment is terminated?
IaC (CloudFormation);EC2 & Compute
When should a team choose Elastic Beanstalk versus more granular services like ECS, EKS, or manually managed EC2 for deploying an application?
Advanced
Elastic Beanstalk is often the right choice for teams that want to move quickly without deep infrastructure expertise while still retaining the flexibility to access underlying resources if needed, whereas ECS or EKS are typically better suited for organizations already committed to a container based architecture with more complex orchestration needs, and fully manual EC2 management makes sense when an application has highly specific or unusual infrastructure requirements that do not fit well within Elastic Beanstalk's more opinionated platform model.
// Decision factors: team's infrastructure expertise,
// need for container orchestration, and desired level of control
Real-world example
A small engineering team building a straightforward web application chooses Elastic Beanstalk to move quickly, while a larger platform engineering team already standardized on Kubernetes chooses EKS instead, since it better fits their existing container orchestration expertise and tooling.
Common follow-ups: What are the migration paths available if a team outgrows Elastic Beanstalk's capabilities?;How does the operational overhead of Elastic Beanstalk compare to ECS or EKS over the long term?
Amazon ECS (Elastic Container Service);Amazon EKS (Elastic Kubernetes Service)